Japan's Nikkei climbed 1.1% and was trading at 16,610.19 points in early trade session.

All eyes are on the Fed, which concludes its two-day policy meeting later on Wednesday, Reuters story reported.

The U.S. central bank is widely expected to stand pat on monetary policy and the markets will sift through its statements - a post-meeting press conference will not be held - for any hints of a future interest rate hike, the report added.